What is the default action for an SRX device in transparent mode to determine the outgoing interface for an
unknown destination MAC address?

A.
Perform packet flooding.

B.
Send an ARP query.

C.
Send an ICMP packet with a TTL of 1.

D.
Perform a traceroute request.

Explanation:
http://www.juniper.net/techpubs/software/junos-security/junos-security95/junos-security- swconfiginterfaces-and-routing/understand-l2-forwarding-tables-section.html